John h



(No Model.)

J. H. SHAW.

I EXTENSION KEY.

No. 337,203. Patented Mar. 2, 1886.-

NiTnn STATES tries.

ATEN'I JOHN H. SHAW, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO SARGENT & 00., OF SAME PLACE.

EXTENSlpN-KEY.

SPECIFICATION forming part of Letters Patent No. 337,203, dated March 2. 1886.

Application filed January 18, 1886. Serial No. 188,880. (No model.)

T all whom it may concern.-

Be it known that I, J oHN H. SHAW, of New Haven, in the county of New Haven and State of Connecticut, have invented new Improvements in ExtensionrKeys; and I do herea by declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part ofthis specification, and represent, in-

Figure l, a perspective view of the said key; Fig. 2, a transverse central section of the same; Fig. 3, a vertical section through the This invention relates to animprovementin extension-keys, and particularly to that class which are constructed for sliding doors-that is, doors which are arranged to slide into a pocket-and so that the front edge of the door may stand flush with the jamb when the door is open. In this style of doors the key cannot extend beyond the plane of the door without striking the jamb, and so preventthe full opening of the door, and, as doors vary in thickness, it'necessitates the manufacture of keys of various lengths.

The object of this invention is to construct akey which may be readily adjusted to doors of various thicknesses; and it consists in the construction as hereinafterdescribed, and particularly recited in the claim.

A represents the body of the key, which is tubular, and constructed with the usual bit, a, at one end, and with a small hole, I), transversely through it near the other end, adapted to receive a pin or rivet, (I.

B is the spindle, to which the handle or bow e, of any desired shape, is pivoted, so that it may be turned at right angles to the axis of the spindle, and thereby set flush into the recess prepared for it in the door. The spindle is adapted to slide into the tubular body A, and is constructed with a series of notches, f, in a plane corresponding to ,the hole I) in the body of the key, and with either of whichthe pin (1 may engage, and thereby hold the shank securely in the body.

To adjust the key, remove the pin d and move the shank B out or into the body A until the key is of the desired length. Then replace the pin d, which will engage one of the notches f and securely hold the parts as before.

I have shown the pin d as threaded at one end, and the hole b correspondingly threaded, as seen in Fig. 3, so that the pin may be readily removed; but as it is unnecessary to change the length of the key when once adjusted to the door the pin may be riveted or otherwise set and the thread may be omitted.

I am aware that extension-keys of this class are not new, and do not therefore wish to be understood as broadly claiming such as my invention.

I claim- In an extension-key, the combination, with the tubular body A, constructed with a bit, a, of the spindle B, provided with a finger-piece, e, and constructed with a series of notches, f, and a pin passed transversely through the body A, and adapted to engage the notchesin the spindle, substantially as described.

JOHN H. SHAW. Witnesses:

WM. S. COOKE, C. D. BALDWIN. 

